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• 14:26, 14 September 2023 Verbovet talk contribs created page Seminar talk, 25 October 2023 (Created page with "{{Talk | speaker = Yuri Sachkov | title = Lorentzian geometry in the Lobachevsky plane | abstract = We consider left-invariant Lorentzian problems on the group of proper affine functions on the line. These problems have constant sectional curvature, thus are locally isometric to standard constant curvature Lorentzian manifolds (Minkowski space, de Sitter space, and anti-de Sitter space). For these problems, the attainability set is described, existence of optimal traje...")